.xi-cha>span {
    background-color: #aaa;
    padding: 20px 10px;
}

.carousel {
    height: 737px;
}

.lunbo-box {
    margin-left: auto;
    margin-right: auto;
    position: relative;
    overflow: hidden;
    z-index: 1;
}
@media only screen and (max-width: 639px){
    .lunbo-box img {
    min-width: initial;
    min-height: 300px;
}
}
@media only screen and (min-width: 640px) and (max-width: 767px){
    .lunbo-box img {
        min-width: initial;
        min-height: 300px;
}
}
@media screen and (min-width: 768px) and (max-width: 959px){
    .lunbo-box img {
        min-width: initial;
        min-height: 300px;
}
}




@media only screen and (max-width: 639px){
    .carousel-control-prev, .carousel-control-next{
    width: 18px;
    height: 22px;
    background-size: contain;
    margin:  140px auto;
}
}
@media only screen and (min-width: 640px) and (max-width: 767px){
    .carousel-control-prev, .carousel-control-next{
        width: 18px;
        height: 22px;
        background-size: contain;
        margin:  140px;
    }
}
@media screen and (min-width: 768px) and (max-width: 959px){
    .carousel-control-prev, .carousel-control-next{
        width: 18px;
        height: 22px;
        background-size: contain;
        margin:  140px auto;
    }
}


